An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, The HTTP…
Priority MEDIUM 53CWE-77Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-77.
Summary
An issue was discovered in D-Link DIR816_A1_FW101CNB04 750m11ac wireless router, The HTTP request parameter is used in the handler function of /goform/form2userconfig.cgi route, which can construct the user name string to delete the user function. This can lead to command injection through shell metacharacters.
Why it matters now
EPSS 0.08624 95th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 2
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:dlink:dir-816_firmware:101cnb04:*:*:*:*:*:*:* | 101cnb04 | Vulnerable | D-Link Japan K.K. |
| cpe:2.3:h:dlink:dir-816:a1:*:*:*:*:*:*:* | a1 | Running on | D-Link Japan K.K. |
- cpe:2.3:o:dlink:dir-816_firmware:101cnb04:*:*:*:*:*:*:* Versions 101cnb04 Vulnerable ·D-Link Japan K.K.
- cpe:2.3:h:dlink:dir-816:a1:*:*:*:*:*:*:* Versions a1 Running on ·D-Link Japan K.K.
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-39510
- 2026-10-03 Alias added: GHSA-wf4j-v485-5m9f
- 2026-10-13 EPSS moved to the 95th–99th percentile
References
More D-Link Japan K.K. Dir-816 Firmware vulnerabilities
- TI-2025-28895 An issue D-Link DIR-816-A2 DIR-816A2_FWv1.10CNB05_R1B011D88210 allows a remote attacker… CVSS 3.1CRITICAL 9.8
- TI-2024-38028 An access control issue in the component formDMZ.cgi of D-Link… CVSS 3.1CRITICAL 9.8
- TI-2023-09977 Command Injection vulnerability in D-Link Dir 816 with firmware version… CVSS 3.1CRITICAL 9.8
- TI-2022-20974 D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the pskValue… CVSS 3.1CRITICAL 9.8
- TI-2022-20973 D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the… CVSS 3.1CRITICAL 9.8
- TI-2022-20972 D-Link DIR-816 A2 1.10 B05 was discovered to contain a stack overflow via the pskValue… CVSS 3.1CRITICAL 9.8
Sources
- CVE-2021-39510 · CVE Program
- CVE-2021-39510 · NVD
- FIRST EPSS
- GHSA-wf4j-v485-5m9f · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences